Drill Mech Arm is a arm part mech component which does not require salvaged materials to craft. This mech component is one of the rewards of the Test Drive quest - it is automatically placed into the mech's Right Arm slot at the Mech Assembly Station upon quest completion. The quest also awards the crafting recipe for this component, allowing copies to be made at a Mech Part Crafting Table.

While equipped, the player can use the Drill Mech Arm while piloting their mech to spin up the drill. Once the drill is spinning at max speed (0.6 seconds is required to spin up to max speed from a dead stop or return to a dead stop from a maximum-speed spin), an energy cone materializes in front of the drill which deals 25 damage every 0.2 seconds to enemies touching it, producing a damage rate of 5 damage ticks per second and a DPS of 125. This energy cone also deals strong knockback to enemies it hits.

In addition, the energy cone deals 0.7 block damage every 0.15 seconds to up to 3 layers of blocks at once, producing a mining rate of ~6.67 block damage ticks per second and a block DPS of ~4.67 (for comparison, a basic Matter Manipulator has a block DPS of 4.8). Note that while the energy cone can only "target" foreground blocks, both foreground and background blocks are mined.